<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<div id="app">
<!--  <h2 :style="{key(属性名): value(属性值)}">{{message}}</h2>-->
      <h2 :style="{fontSize: finalSize}">{{message}}</h2>
      <h2 :style="{fontSize: finalsize + 'px'}">{{message}}</h2>
</div>

<script src="../js/vue.js"></script>
<script>
    const  app = new Vue({
      el:'#app',
      data:{
        message: '卢本伟牛逼！',
        finalSize: '100px',
        finalsize: '100'
      }
    })
</script>
</body>
</html>